Electromagnetic driving module and camera device using the same

ABSTRACT

An electromagnetic driving device is provided, which includes a movable member, a stationary member, a driving magnet, a driving coil, a conductive layer, and an external terminal. The movable member and the stationary member are arranged separate from each other along a main axis. The driving magnet is positioned on the movable member. The driving coils are arranged corresponding to the driving magnet and are disposed in the stationary member. The conductive layer is electrically connected to the driving coils and is disposed in the stationary member. The external terminal is exposed by the fixed member and electrically connected to the conductive layer. The thickness of the external terminal is different from the thickness of the conductive layer.

CROSS REFERENCE TO RELATED APPLICATIONS

This Application claims priority of Taiwan Patent Application No.104138693, filed on Nov. 23, 2015, the entirety of which is incorporatedby reference herein.

BACKGROUND

Field of the Invention

The present invention relates to a driving module and a camera deviceusing the same, and more particularly to an electromagnetic drivingmodule which converts electrical energy into mechanical energy, and acamera device using the same.

Description of the Related Art

Generally, a camera device includes a driving module to drive an elementto move a predetermined distance. For example, a camera device having animage-capturing function usually includes a driving module to generatedriving power. One or more optical lens units of the camera device aredriven by the driving power to move along an optical axis, so as tofacilitate auto-focus and auto-zoom controls.

However, since the driving module includes a complex driving member,such as a stepper motor, ultrasonic motor, piezoelectric actuator, etc.to generate the driving power and the driving power has to betransmitted by a number of transmission elements, it is not easy toassemble, and the manufacturing cost is high. In addition, aconventional driving module is also large in size and has a high powerconsumption due to its complex construction.

SUMMARY

Accordingly, one objective of the present invention is to provide adriving assembly, which is configured to provide a driving force todrive an element such as a lens assembly positioned in a camera deviceto move.

In accordance with some embodiments of the disclosure, the drivingassembly includes a movable member, a stationary member, a drivingmagnet, a driving coil, a conductive layer, and an external terminal.The movable member and the stationary member are arranged separate fromeach other along a main axis. The driving magnet is positioned on themovable member. The driving coils are arranged corresponding to thedriving magnet and are disposed in the stationary member. The conductivelayer is electrically connected to the driving coils and disposed in thestationary member. The external terminal is exposed by the fixed memberand electrically connected to the conductive layer. The thickness of theexternal terminal is different from the thickness of the conductivelayer.

In the above-mentioned embodiments, the thickness of the externalterminal in a direction that is perpendicular to the main axis isgreater than the thickness of the conductive layer in a direction thatis parallel to the main axis.

In the above-mentioned embodiments, the fixed member comprises a coilsubstrate and a lower substrate. A bottom surface of the coil substrateand a top surface of the lower substrate are formed integrally. The coilsubstrate and the lower substrate may be made of the same material. Thedriving coil is positioned in the coil substrate and arranged at aposition that is near the coil substrate. The conductive layer ispositioned in the lower substrate. The external terminal is exposed bythe lower substrate.

In the above-mentioned embodiments, the fixed member comprises aplurality of insulation layers, and the conductive layer is sandwichedbetween the insulation layers.

In the above-mentioned embodiments, the electromagnetic driving assemblyfurther comprises a position sensor and a positioning recess is formedon the top surface of the fixed member. The position sensor ispositioned in the positioning recess. In this manner, the positionsensor is underneath the top surface of the fixed member, or theposition sensor is positioned as high as the top surface of the fixedmember.

In the above-mentioned embodiments, the electromagnetic driving assemblyfurther comprises wire connecting the fixed member to the movablemember, and a connected recess is formed on the top surface of the fixedmember. One end of the wire is fixed in the connected recess.

In the above-mentioned embodiments, the projection of the driving coilin a direction that is parallel to the main axis is located outside ofthe conductive layer.

In the above-mentioned embodiments, the fixed member comprises anextending portion extending in a direction that is parallel to the mainaxis. The external terminal is exposed by a lateral surface of theextending portion away from the main axis and is covered by a lateralsurface of the extending portion near the main axis.

Another objective of the disclosure is to provide a camera deviceincluding the driving assembly in any one of the above-mentionedembodiments. The camera device further includes a lens assemblypositioned on the movable member of the driving assembly. The opticalaxis of the lens assembly is aligned with the main axis.

The electromagnetic driving module has advantages of being easy toassemble and having reduced thickness.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the embodiments and the advantagesthereof, reference is now made to the following descriptions taken inconjunction with the accompanying drawings.

FIG. 1 shows a cross-sectional schematic view of a camera device, inaccordance with some embodiments of the disclosure.

FIG. 2 shows a schematic view of partial elements of an electromagneticdriving module, in accordance with some embodiments of the disclosure.

FIG. 3 shows a cross-sectional schematic view taken along line A-A′ ofFIG. 2.

FIG. 4A shows a cross-sectional view of a position sensor and a fixedmember, in accordance with some embodiments of the disclosure.

FIG. 4B shows a cross-sectional view of a position sensor and a fixedmember, in accordance with some embodiments of the disclosure.

FIG. 5 shows a block diagram of an electromagnetic driving module, inaccordance with some embodiments of the disclosure.

FIGS. 6A-6J show a schematic view of the stages for manufacturingpartial elements of an electromagnetic driving module, in accordancewith some embodiments of the disclosure.

FIG. 7 shows a cross-sectional view of an electromagnetic drivingmodule, in accordance with some embodiments of the disclosure.

FIG. 8 shows a cross-sectional view of an electromagnetic drivingmodule, in accordance with some embodiments of the disclosure.

DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

In the following detailed description, for purposes of explanation,numerous specific details and embodiments are set forth in order toprovide a thorough understanding of the present disclosure. The specificelements and configurations described in the following detaileddescription are set forth in order to clearly describe the presentdisclosure. It will be apparent, however, that the exemplary embodimentsset forth herein are used merely for the purpose of illustration, andthe inventive concept may be embodied in various forms without beinglimited to those exemplary embodiments. In addition, the drawings ofdifferent embodiments may use like and/or corresponding numerals todenote like and/or corresponding elements in order to clearly describethe present disclosure. However, the use of like and/or correspondingnumerals in the drawings of different embodiments does not suggest anycorrelation between different embodiments.

It should be noted that the elements or devices in the drawings of thepresent disclosure may be present in any form or configuration known tothose skilled in the art. In addition, the expression “a layer overlyinganother layer”, “a layer is disposed above another layer”, “a layer isdisposed on another layer” and “a layer is disposed over another layer”may indicate not only that the layer directly contacts the other layer,but also that the layer does not directly contact the other layer, therebeing one or more intermediate layers disposed between the layer and theother layer.

In this specification, relative expressions are used. For example,“lower”, “bottom”, “higher” or “top” are used to describe the positionof one element relative to another. It should be appreciated that if adevice is flipped upside down, an element at a “lower” side will becomean element at a “higher” side.

The terms “about” and “substantially” typically mean +/−20% of thestated value, more typically +/−10% of the stated value and even moretypically +/−5% of the stated value. The stated value of the presentdisclosure is an approximate value. When there is no specificdescription, the stated value includes the meaning of “about” or“substantially”.

FIG. 1 shows a cross-sectional schematic view of a camera device 1, inaccordance with some embodiments of the disclosure. In some embodiments,the camera device 1 includes an electromagnetic driving module 2, anoptical lens assembly 4, a circuit board 5, and an optical sensor 6. Theoptical lens assembly 4 is disposed inside of the electromagneticdriving module 2. Light from the outside passes through the optical lensassembly 4 and is projected on the optical sensor 6 disposed on thecircuit board 5. Once the optical sensor 6 receives the light, a digitalsignal corresponding to the light is produced. The electromagneticdriving module 2 is configured to control the movement of the opticallens assembly 4 in multiple directions (such as a direction that isperpendicular to the optical axis of the optical lens assembly 4). Withthe control of the electromagnetic driving module 2, the light passingthe optical lens assembly 4 is deflected and projected on the opticalsensor 6 correctly, so as to improve the image quality of the cameradevice 1.

In accordance with some embodiments of the disclosure, the structuralfeatures of the electromagnetic driving module 2 are described below.

In some embodiments, as shown in FIG. 1, the electromagnetic drivingmodule 2 includes a housing 20, a fixed member 21, a movable member 22,two spring sheets 23 and 24, a number of suspension wires 25, and anumber of driving magnets, such as two driving magnets 26 and twodriving magnets 27 (only one driving magnet 27 is shown in FIG. 1). Theelements of the electromagnetic driving module 2 can be added to oromitted, and the invention should not be limited by the embodiment.

In some embodiments, the housing 20 includes a front housing member 201and a lateral housing member 202. An opening 203 is formed on the fronthousing member 201 and arranged aligned with a main axis M. The lateralhousing member 202 extends from the edge of front housing member 201 andextends toward the fixed member 21.

FIG. 2 shows a schematic view of partial elements of the fixed member21, in accordance with some embodiments of the disclosure. In someembodiments, the fixed member 21 is rectangular plate and has a topsurface 211 and a bottom surface 212 opposite to the top surface 211.Four lateral surfaces 216 are connected between the top surface 211 andthe bottom surface 212. An opening 213 penetrates the top surface 211and the bottom surface 212 and is aligned with the main axis M (FIG. 1).Four connected recess 215 are formed on four corners of the top surface211. And, two positioning recesses 214 are formed on the top surface 211and respectively arranged adjacent to two of the connected recess 215.

FIG. 3 shows a cross-sectional schematic view taken along line A-A′ ofFIG. 2. In some embodiments, the fixed member 21 has two layeredstructures (i.e., coil substrate 217 and lower substrate 218). The coilsubstrate 217 is disposed on the lower substrate 218, such that the topsurface 211 of the fixed member 21 is defined by the top surface 2171 ofthe coil substrate 217, and the bottom surface 212 of the fixed member21 is defined by the bottom surface 2180 of the lower substrate 218. Itshould be appreciated that, in the disclosure, the fixed member 21 isdivided into two layered structures for the purpose of illustration.However, it is not necessary to require the coil substrate 217 and thelower substrate 218 to be two independent elements. In some embodiments,the bottom surface 2170 of the coil substrate 217 and the top surface2181 of the lower substrate 218 are formed integrally, and there is nogap formed therebetween. In addition, no adhesive or other bondingmaterial is applied between the coil substrate 217 and the lowersubstrate 218. One method for manufacturing the fixed member 21 inaccordance with some embodiments of the disclosure is discussed furtherwith regard to the description of FIG. 7.

In some embodiments, the coil substrate 217 and the lower substrate 218are made of the same insulating material, such as insulating materialconsisting of glass fiber, non-woven material, and resin, but thedisclosure should not be limited thereto. The coil substrate 217 and thelower substrate 218 may be made of different material. In addition, thecoil substrate 217 and the lower substrate 218 may have differentthickness. For example, in a direction that is parallel to the main axisM, the thickness of the coil substrate 217 is less than that of thelower substrate 218 in the same direction.

Referring to FIGS. 2 and 3, in some embodiments, the electromagneticdriving module 2 further includes a number of external terminals 28, aconductive layer 29 (FIG. 3), a number of driving coils (such as twodriving coils 30 and two driving coils 31), a number of position sensors32, and a number of vias (such as vias 33, 34, and 35). The externalterminals 28, the conductive layer 29, the driving coils 30 and 31, theposition sensors 32, and the vias 33, 34, and 35 are supported by thefixed member 21.

The external terminals 28 are adapted for the connection to externalcontrol circuit. The electrical signals from the external controlcircuit (not shown in the figures) are transmitted to other elements ofthe electromagnetic driving module 2 via the external terminals 28.Additionally and alternatively, the electrical signals from otherelements of the electromagnetic driving module 2 are transmitted to theexternal control circuit via the external terminals 28. In someembodiments, each of the external terminals 28 includes a sheet metal,and the surface of each external terminal is exposed to the outside bythe lateral surfaces 216.

In some embodiments, each of the external terminals 28 is formed into anL-shaped configuration. A region of the surface of the externalterminals 28 is exposed by the lateral surfaces 216, and another regionof surface of the external terminals 28 is exposed by the bottom surface212. In addition, since the external terminals 28 are inserted into thelower substrate 218, the external terminals 28 are prevented from beingdeformed to ensure the stability of the electrical connection to theexternal circuit.

The conductive layer 29 electrically connects the external terminals 28to the other electric elements in the electromagnetic driving module 2,in some embodiments, the conductive layer 29 is positioned in the lowersubstrate 218 and not exposed to the outside. In addition, theconductive layer 29 is positioned near the driving coil 217. Namely, thedistance D1 between the conductive layer 29 and the top surface 2181 ofthe lower substrate 218 is less than the distance D2 between theconductive layer 29 and the bottom surface 2180 of the lower substrate218. In this manner, the required length of the internal traceconnecting between the driving coils 30 and 31 to the conductive layer29 is decreased, and the stability of the electrical connection isensured.

In some embodiments, the thickness of the external terminals 28 isdifferent from the thickness of the conductive layer 29. For example,each of the external terminals 28 has a thickness of T1 in a directionthat is perpendicular to the main axis M, and the conductive layer 29has a thickness of T2 in a direction that is parallel to the main axis.The thickness T2 of the conductive layer 29 is less than the thicknessT1 of the external terminals 28 so as to satisfy reduced-thicknessrequirement of the electromagnetic driving module 2.

The driving coils 30 and 31 electrically connect the conductive layer 29and are configured to generate a magnetic field to drive the movablemember 22 to move relative to the fixed member 21. In some embodiments,as shown in FIG. 2, the two driving coils 30 are arranged to be adjacentto the two opposite lateral surfaces 216 in the X-axis direction, andthe two driving coils 31 are arranged to be adjacent to the two oppositelateral surfaces 216 in the Y-axis direction. In some embodiments, theinterrelationship of each driving coils 30 and 31 and the other elementsare similar. For the purpose of brevity, only the features regarding oneof the driving coils 30 are described below. However, the driving coilsmay be arranged in different configurations, and the invention shouldnot be limited by the embodiment.

In some embodiments, as shown in FIG. 3, the driving coil 30 ispositioned in the coil substrate 217 and is not exposed to the outsideof the coil substrate 217. The driving coil 30 is connected to theconductive layer 29 by the via 34, and the projection of the drivingcoil 30 in a direction that is parallel to the main axis M is notoverlapped with the conductive layer 29. As a result, the occurrence ofparasitic capacitance is avoided, and the operation in theelectromagnetic driving module 2 is conducted correctly.

In some embodiments, the driving coil 30 includes two conductivestructures 301 and 302. The two conductive structures 301 and 302 areconfigured to generate magnetic field so as to actuate the movement ofthe movable member 22. In some embodiments, the two conductivestructures 301 and 302 are spaced from the top surface 211 of the fixedmember 21 by a different distance, wherein the conductive structure 301is closer to the top surface 211 of the fixed member 21 than theconductive structure 302. The width (the distance between the outermostconductive structures at two opposite sides) of the two conductivestructures 301 and 302 may be different so to optimize operation in theelectromagnetic driving module 2. For example, in a direction that isperpendicular to the main axis M, the width of the conductive structure301 is greater than that of the conductive structure 302.

It should be appreciated that the number of layers in the conductivestructure should not be limited to the embodiment. The number of layersmay be greater than three, and the number may be either an even numberor an odd number.

In some embodiments, the two driving coils 30 are connected by aconductive trace (not shown in the figures) positioned in the coilsubstrate 217, so that the two driving coils 30 are supplied with thesame electric current in the operation of the electromagnetic drivingmodule 2. Additionally, the two driving coils 31 are connected by aconductive trace (not shown in the figures) positioned in the coilsubstrate 217, so that the two driving coils 30 are supplied with thesame electric current in the operation of the electromagnetic drivingmodule 2. However, the disclosure should not be limited to theembodiment. In some other embodiments, each of the two driving coils 30is connected to the conductive layer 29 by a respective conductivetrace, and each of the two driving coils 31 is electrically connected tothe conductive layer 29 by a respective conductive structure. The twodriving coils 30 are supplied with the same electric current from theconductive layer 29, and the two driving coils 31 are supplied with thesame electric current from the conductive layer 29.

As shown in FIG. 2, the two position sensors 32 are configured to detectchanges in the magnetic field of the driving magnets 26 and 27 (FIG. 1)and to produce electric signals to the control module (not shown in thefigures) according to the detected result, so as to establish aclosed-loop control. In some embodiments, the two position sensors 32are positioned in the two respective positioning recesses 214 of thefixed member 21 and are electrically connected to the conductive layer29 (FIG. 3). To satisfy the reduced-thickness requirement of theelectromagnetic driving module 2, the position sensors 32 are positionedunderneath the top surface 211 of the fixed member 21. Alternatively,the position sensors 32 are positioned as high as the top surface 211 ofthe fixed member 21. In some embodiments, the two position sensors 32are Hall sensors. However, it should be appreciated that othervariations and modifications can be made to embodiments of thedisclosure. For example, as shown in FIG. 4A, the two position sensors32 are inserted into the fixed member 21, and the top surfaces 321 ofthe position sensors 32 are as high as the top surface 211 of the fixedmember 21. Alternatively, as shown in FIG. 4B, the two position sensors32 are inserted into the fixed member 21, and the top surfaces 321 ofthe position sensors 32 are not exposed to the outside of the fixedmember 21.

Referring to FIG. 1, the movable member 22 is configured to receive theoptical lens assembly 4 so as to enable the optical lens assembly 4 tomove in the camera device 1. In some embodiments, the movable member 22is an auto focusing module (AF module) and includes a frame 221 and alens barrel 222. The lens barrel 222 is surrounded by the frame 221. Achannel 223 penetrates the lens barrel 222 along the main axis M and isarranged to correspond to the opening 203. The optical lens assembly 4is positioned in the channel 223, wherein the optical axis of theoptical lens assembly 4 is aligned with the main axis M. It should beappreciated that, while the movable member 22 shown in FIG. 1 is used toreceive an optical lens assembly 4, the disclosure should not be limitedto the embodiment. The movable member 22 can be used to receive otherelements.

Two spring sheets 23 and 24 are respectively connected to the upper sideand the lower side of the movable member 22. In some embodiments, thelens barrel 222 for receiving the optical lens assembly 4 is positionedbetween the two spring sheets 23 and 24. The two spring sheets 23 and 24enable the lens barrel 222 to move relative to the fixed member 21 alonga direction that is parallel to the main axis M.

The suspension wires 25 are configured to enable the movable member 22to move in a direction that is perpendicular to the main axis M. In someembodiments, the electromagnetic driving module 2 includes foursuspension wires 25 connected between the fixed member and the movablemember 22. Specifically, one end 251 of each suspension wire 25 isconnected to the spring sheet 23 positioned on the movable member 22,and the other end 252 of each suspension wire 25 is connected to theconnected recess 215 of the fixed member 21 via an adhesive material 25.The adhesive material 25 may include solder or another suitablematerial. Since the ends 252 of the suspension wires 25 are received inthe connected recesses 215, the suspension wires 25 have sufficientlength that allows the movable member 22 to move within a greater rangein the X-Y plane. Therefore, even though the total thickness of theelectromagnetic driving module 2 is decreased, the specifications of theelectromagnetic driving module 2 are maintained.

In some embodiments, the suspension wires 25 are electrically connectedto the conductive layer 29 (FIG. 3) in the fixed member 21. Electricalsignals from the conductive layer 29 are transmitted to the movablemember 22 through the suspension wires 25 and the spring sheet 23 tofacilitate control of the movable member 22. In some non-illustratedembodiments, the two spring sheets 23 and 24 are omitted. The movablemember 22 includes a flange (not shown in the figures) extendingoutwardly; and each of the suspension wires 25 is connected between theflange of the movable member and the fixed member 21.

In some embodiments, the driving magnets 26 and 27 are positioned at thebottom surface of the movable member 22 that faces the fixed member 21and arranged to correspond to the driving coils 30 and 31. Specifically,the two driving magnets 26 are arranged to correspond to the drivingcoils 30, and the two driving magnets 27 (only one driving magnet 27 isshown in FIG. 1) are arranged to correspond to the driving coils 31(only one driving coil 31 is shown in FIG. 1). As a result, the movablemember 22 is driven to move in the Y-direction by the magnetic forceproduced by the two driving coils 30 and the two driving magnets. Inaddition, the movable member 22 is driven to move in the X-direction bythe magnetic force produced by the two driving coils 31 and the twodriving magnets 27. In some embodiments, the driving magnets 26 and 27are arranged to correspond to a coil (not shown in the figure)positioned on the lens barrel 222. And, the lens barrel 222 is driven tomove in the Z-direction by the magnetic force produced by the coil andthe driving magnets 26 and 27.

It should be noted that, in the above embodiments, since the positionsensors 32 are disposed in the positioning recesses 214 and the adhesivematerial 253 for fixing the suspension wires 25 is applied in theconnected recesses 215, the position sensors 32 and the adhesivematerial 253 are not projected beyond the top surface 211 of the fixedmember 21. As a result, the reduced-thickness requirement of theelectromagnetic driving module 2 is satisfied. On the other hand, insuch arrangements, the distance between the driving coils 30 and 31disposed in the fixed member 21 and the driving magnets 26 and 27 aredecreased, so that the driving force of the electromagnetic drivingmodule 2 is improved.

FIG. 5 shows a block diagram of partial elements of the electromagneticdriving module 2, in accordance with some embodiments of the disclosure.In some embodiments, the conductive layer 29 is electrically connectedto the movable member 22, the driving coils 30, and the position sensor32. Electrical signals from the control circuit 7 are transmitted to themovable member 22, the driving coils 30 and 31, and the position sensor32 via the external terminals 28 and the conductive layer 29. Therefore,the electromagnetic driving module 2 can be connected to the controlcircuit 7 with the least waste of time, and the manufacturing cost andthe manufacturing time is decreased.

The method for manufacturing the fixed member 21 according to someembodiments of the disclosure is described below.

FIGS. 6A-6J show a schematic view of the stages for manufacturing thefixed member 21, in accordance with some embodiments of the disclosure.As shown in FIG. 6A, the method for manufacturing the fixed member 21begins with forming an insulation layer 80 and forming a conductivematerial 301 on the insulation layer 80. In some embodiments, theconductive material 301 is formed on the insulation layer 80 by bondingor coating techniques. Afterwards, as shown in FIG. 6B, an insulationlayer 81 is formed on the layer of conductive material 301 and adrilling process is performed to form a blind hole 811 on the insulationlayer 81 to expose the conductive material 301. The insulation layer 81is formed on the conductive material 301 by bonding or coatingtechniques. Afterwards, as shown in FIG. 6C, a via 35 is formed in theblind hole 811 and a conductive material 302 is formed on the insulationlayer 81. Afterwards, as shown in FIG. 6D, an insulation layer 82 isformed on the conductive material 302 and a drilling process isperformed to form a blind hole 821 on the insulation layer 82 to exposethe conductive material 302.

Afterwards, as shown in FIG. 6E, a via 34 is formed in the blind hole821 and a conductive layer 29 is formed on the insulation layer 82.Afterwards, as shown in FIG. 6F, an insulation layer 83 is formed on theconductive layer 29 and a drilling process is performed to form a blindhole 831 on the insulation layer 83 to expose the conductive layer 29.Afterwards, as shown in FIG. 6G, a via 33 is formed in the blind hole831. Afterwards, as shown in FIG. 6H, an insulation layer 84 is formedon the insulation layer 83 and a drilling process is performed to form ablind hole 841 on the insulation layer 84 to expose the via 33.Afterwards, as shown in FIG. 6I, terminals are formed on the insulationlayer 82 and formed in the blind hole 841. Afterwards, a cutting processis performed along the edge of the blinding hole 841 so as to form thefixed member 21, as shown in FIG. 6J. In the fixed member 21, the coilsubstrate 217 includes the insulation layers 80, 81, and 82, and thelower substrate 218 includes the insulation layers 83 and 84.

In some embodiments, the external terminals 28, the conductive layer 29,the driving coils 30 and 31, the position sensors 32, and the vias 33include but are not limited to nickel, gold, tin, lead, copper,aluminum, silver, chromium, tungsten, or alloys thereof. In addition,the insulation layers 80-84 include but are not limited to epoxy resin,bismaleimide triacine, polyimide, Ajinomoto build-up film, polyphenylene oxide, polypropylene, polymethyl methacrylate,polytetrafluorethylene. No adhesive material is used to bond theinsulation layers 80-84, and no gap is formed between the insulationlayers 80-84.

FIG. 7 shows a cross-sectional view of a fixed member 21 c of anelectromagnetic driving module 2 c, in accordance with some embodimentsof the disclosure. In the embodiments of FIG. 7, elements similar tothose of the embodiments of FIGS. 1-3 are provided with the samereference numbers, and the features thereof are not repeated in theinterest of brevity. In some embodiments, a coil substrate 217 and alower substrate 218 of the fixed member 21 c are fabricatedindependently and are connected to one another by the top surface 2181and the bottom surface 2170, wherein an electrical connection isestablished by the connection of electrical contacts 2173 and 2183. Inaddition, the position sensor 32 is positioned on the top surface 2181and is electrically connected to the conductive layer 29.

FIG. 8 shows a cross-sectional view of a fixed member 21 d of anelectromagnetic driving module 2 d, in accordance with some embodimentsof the disclosure. In the embodiments of FIG. 8, elements similar tothose of the embodiments of FIGS. 1-3 are provided with the samereference numbers, and the features thereof are not repeated in theinterest of brevity. In some embodiments, the fixed member 21 d includesa lower substrate 218 d. The lower substrate 218 d has an extendingportion 2185 d extending in a direction that is parallel to the mainaxis M. The external terminal 28 is exposed by a lateral surface of theextending portion 2185 d away from the main axis M and is covered by alateral surface of the extending portion 2185 d near the main axis M.Since the external terminal 28 is inserted into the lower substrate 218d, the external terminal 28 is prevented from being deformed to ensurethe stability of the electrical connection to the external circuit.

Compared with a conventional driving module, the electromagnetic drivingmodule of the disclosure has fewer elements, and thus the manufacturingcost is reduced and the manufacturing process is simplified. Inaddition, in the disclosure, since the conductive layer, the drivingcoils, and the external terminals of the electromagnetic driving moduleare directly formed on one single fixed member, the processes to bondthe neighboring elements by the use of adhesive material are omitted.Therefore, the problem of the driving coils and the driving magnetshaving unequal spaced distance due to unevenly applied adhesive materialis prevented. As a result, in addition to having reduced thickness, theelectromagnetic driving module has an improved driving force and controlaccuracy.

Although the embodiments and their advantages have been described indetail, it should be understood that various changes, substitutions, andalterations can be made herein without departing from the spirit andscope of the embodiments as defined by the appended claims. Moreover,the scope of the present application is not intended to be limited tothe particular embodiments of the process, machine, manufacture,composition of matter, means, methods, and steps described in thespecification. As one of ordinary skill in the art will readilyappreciate from the disclosure, processes, machines, manufacture,compositions of matter, means, methods, or steps, presently existing orlater to be developed, that perform substantially the same function orachieve substantially the same result as the corresponding embodimentsdescribed herein may be utilized according to the disclosure.Accordingly, the appended claims are intended to include within theirscope such processes, machines, manufacture, compositions of matter,means, methods, or steps. In addition, each claim constitutes a separateembodiment, and the combination of various claims and embodiments arewithin the scope of the disclosure.

What is claimed is:
 1. An electromagnetic driving assembly, comprising:a movable member; a fixed member spaced apart from the movable member,wherein the movable member and the fixed member are arranged along amain axis; a driving magnet disposed on the movable member; a drivingcoil formed in the fixed member and arranged to correspond to thedriving magnet; a conductive layer formed in the fixed member andelectrically connected to the driving coil; and a terminal exposed bythe fixed member and electrically connected to conductive layer, whereinthe thickness of the terminal is different from the thickness of theconductive layer, and the driving coil, the conductive layer and theterminal are embedded in the fixed member.
 2. The electromagneticdriving assembly as claimed in claim 1, wherein the thickness of theterminal in a direction that is perpendicular to the main axis isgreater than the thickness of the conductive layer in a direction thatis parallel to the main axis.
 3. The electromagnetic driving assembly asclaimed in claim 1, wherein the fixed member comprises: a coilsubstrate, wherein the driving coil is positioned in the coil substrate;and a lower substrate, wherein the conductive layer is positioned in thelower substrate and arranged at a position that is near the coilsubstrate, and the terminal is exposed by the lower substrate.
 4. Theelectromagnetic driving assembly as claimed in claim 1, wherein thefixed member comprises: a coil substrate, wherein the driving coil ispositioned in the coil substrate; and a lower substrate, wherein theconductive layer is positioned in the lower substrate, and the terminalis exposed by the lower substrate, wherein a bottom surface of the coilsubstrate and a top surface of the lower substrate are formedintegrally.
 5. The electromagnetic driving assembly as claimed in claim4, wherein the coil substrate and the lower substrate are made of thesame material.
 6. The electromagnetic driving assembly as claimed inclaim 1, wherein the fixed member comprises a plurality of insulationlayers, and the conductive layer is sandwiched between the insulationlayers.
 7. The electromagnetic driving assembly as claimed in claim 1,further comprising a position sensor, wherein the position sensor isdisposed underneath a top surface of the fixed member, or the positionsensor is flush with the top surface of the fixed member.
 8. Theelectromagnetic driving assembly as claimed in claim 7, wherein apositioning recess is formed on the top surface of the fixed member, andthe position sensor is disposed in the positioning recess.
 9. Theelectromagnetic driving assembly as claimed in claim 1, furthercomprising a wire connecting the fixed member to the movable member, anda connected recess is formed on the top surface of the fixed member,wherein one end of the wire is fixed in the connected recess.
 10. Theelectromagnetic driving assembly as claimed in claim 1, wherein aprojection of the driving coil in a direction that is parallel to themain axis is located outside of the conductive layer.
 11. Theelectromagnetic driving assembly as claimed in claim 1, wherein thefixed member comprises an extending portion extending in a directionthat is parallel to the main axis, wherein the terminal is exposed by alateral surface of the extending portion away from the main axis and iscovered by a lateral surface of the extending portion near the mainaxis.
 12. A camera device, comprising: an electromagnetic drivingassembly comprising: a movable member; a fixed member spaced apart fromthe movable member, wherein the movable member and the fixed member arearranged along a main axis; a driving magnet disposed on the movablemember; a driving coil formed in the fixed member and arranged tocorrespond to the driving magnet; a conductive layer formed in the fixedmember and electrically connected to the driving coil; and a terminalexposed by the fixed member and electrically connected to conductivelayer, wherein the thickness of the terminal is different from thethickness of the conductive layer, and the driving coil, the conductivelayer and the terminal are embedded in the fixed member; and a lensassembly positioned in the movable member, wherein the optical axis ofthe lens assembly is aligned with the main axis.